So, it turns out the reason I got no feedback on this tool, was that I forgot both to email about and to actually push the code to github :O So this is actually code that's almost half a year old and that I was supposed to submit for the first or second commitfest. Oops.
So, the tool and a README for it right now can be found at https://github.com/mhagander/pg_retainxlog for the time being. The idea behind the tool is to plug a hole in the case when pg_receivexlog is used for log archiving, which is that you still need a "blocking" archive_command in order to make sure that files aren't recycled on the master. So for 9.2 you can do this with an archive_command that checks if the file has appeared properly on the slave - but that usually means you're back at requiring ssh connectivity between the machines, for example. Even though this information is actually avialable on the master... This can also be of use to pure replication scenarios, where you don't know how to tune wal_keep_segments, but using actual live feedback instead of guessing. When pg_retainxlog is used as an archive_command, it will check the pg_stat_replication view instead of checking the slave. It will then only return ok once the requested logfile has been replicated to the slave. By default it will look for a replication client named pg_receivexlog, but it supports overriding the query with anything - so you can say things like "needs to have arrived on at least two replication slaves before we consider it archived". Or if used instead of wal_keep_segmnets, needs to have arrived at *all* replication slaves. Is this a tool that people would like to see included in the general toolchain? If so, I'll reformat it to work in the general build environment and submit it for the last commitfest. (comments on the code itself are of course also welcome) -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
